Property value disappear on click with user control

Hi,

I have a user control which require input text boxes and a caclulate button. When I hit the recalculate button, lblMonth becomes blanks. Please see the code below and guide how to keep the lblMonth the value of lblMonth

============
<asp:UpdatePanel ID="upPanelSales" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="lblMonth" runat="server" Font-Bold="true" ForeColor="white" CssClass="heading" />
-- some text box controls
<asp:Button ID="btnReCalc" runat="server" Text="Recalc." CommandName="Calculate" CommandArgument="ReCalc" OnCommand="Calculate" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnReCalc" EventName="Command" />
</Triggers>
</asp:UpdatePanel
Code Behind
Private _MonthNameAs String

Public Property MonthName()As String
Get
Return _MonthName
End Get
Set(ByVal valueAs String)
_MonthName = value
End Set
End Property

Protected Sub Page_PreRender(ByVal senderAs Object,ByVal eAs System.EventArgs)Handles Me.PreRender
Me.lblMonth.Text = _MonthName
End Sub

Protected Sub Calculate(ByVal senderAs Object,ByVal eAs CommandEventArgs)
If e.CommandName ="Calculate"Then
Select Case e.CommandArgument
Case"ReCalc"
ReCalculate()
End Select
End If
End Sub

Main Page
=========

<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true" />
<Sales:Input ID="uc" runat="server" />
Code Behind

Sub Page_Load
uc.MonthName = Month1
End Sub

you probably want to do this in your main page code behind so it only gets set when the page loads the first time

Sub Page_Load

if not Page.IsPostBack Then
uc.MonthName = Month1
end if
End Sub

My main page contains 4 link button controls called Qtr1, Qtr2, Qtr3, Qtr4 and I want to change the month value based on user clicking on quarter links? The real problem is due to submit button inside the user control and partial page refresh has applied on this user control.

so you solved it? or you're still asking?

if those 4 links are outside of the updatepanel they will trigger a full post back and the data inside the update panel contents will be treated no differently than if they weren't inside an updatepanel.

if you click the the linkbutton inside the updatepanel the only thing that will happen is the data within the updatepanel will postback and the associated button event will fire. Only data within the updatepanel will post back to the server though. Data outside of the updatepanel will still appear to the server as the same data regardless of change on the client side...